The Modular Manual Browser

sys_attrs_cam(5) sys_attrs_cam(5)
NAME
sys_attrs_cam, sys_attrs_cam_disk, sys_attrs_cam_tape - SCSI CAM I/O sub-
system attributes
DESCRIPTION
This reference page lists and describes attributes for the following kernel
subsystems associated with the SCSI CAM I/O system:
+cam+cam_adapter-id+cam_disk+cam_tape
An asterisk (*) precedes the name of an attribute that is modifiable at run
time. However, the ability to modify the value at run-time may be a
software requirement. Read the attribute description carefully to determine
whether run-time configuration should ever be done manually.
Refer to the sys_attrs(5) reference page for an introduction to the topic
of kernel subsystem attributes.
cam and Adapter-Specific Cam Subsystem Attributes
Values of attributes for the CAM (cam) subsystem and adapter-specific
(cam_adapter-id) CAM subsystems should never be modified.
cam_disk Subsystem Attributes
Attributes for the cam_disk subsystem should be changed internally or under
the direction of support personnel. Most of these attributes have a global
effect across all disk devices. If the affected devices are of the same
type, a global change may be appropriate. However, global changes applied
to devices with different requirements is likely to adversely affect some
of the devices. The Hardware Manager application allows you to apply
device-specific adjustments and it is recommended that you use this inter-
face.
disk_busy_timeout
Number of seconds that the subsystem waits in the presence of repeated
device busy signals before performing a bus device reset operation on
the device.
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation.
disk_iob_aptpl
This attribute has effect only in a TruCluster environment.
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation.
disk_iob_console_key
This attribute has effect only in a TruCluster environment.
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation.
disk_iob_retry
This attribute has effect only in a TruCluster environment.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
disk_no_response_time
A value that indicates how long to wait after the start of constant "no
connection" errors for the disk device before starting recovery pro-
cedure. The default value indicates that all bits are set to 1. This
specifies that disk driver defaults for this wait interval are applied.
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation. A setting change is
global; that is, it overrides the default wait interval for all disk
drivers and is likely to cause unpredictable behavior in some devices.
disk_path_fail_limit
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation.
initialized
Disk drive initialization state, which is set by the subsystem. This
attribute is query only.
major_number_new
A query-only identifier that is set by the subsystem.
major_number_old
A query-only identifier that is set by the subsystem.
max_spinups_per_bus
Do not modify the setting for this attribute unless instructed to do so
by support personnel or by patch kit documentation.
Default value: 2 (spinups)
pwrmgmt_poll_period
Number of seconds that device polling reveals a drive is inactive
before spinning down the disk.
Default value: 30 (seconds)
Minimum value: 5
Maximum value: 65,535
cam_tape Subsystem Attributes
fixed_block_padding
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Default value: 0
initialized
A value queried by the tape device driver to determine its initializa-
tion state. You cannot modify this variable. The driver changes the
value from 0 (when the system starts to boot) to 1 (during the boot
operation).
open_behaviour
A value that specifies the system behavior when a write-locked tape is
opened with the O_RDWR or O_WRONLY flag. The default and recommended
behavior (1) is to return failure on the open operation. The alternate
behavior (0) is to allow the open operation but return failure on an
attempt to write to the tape.
Default value: 1
It is recommended that you do not change the default. The 0 value is
intended only for customers whose applications ran on DIGITAL UNIX ver-
sions earlier than Version 4.0B and depend on the open behavior in
effect for those earlier versions.
SEE ALSO
sys_attrs(5)